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Title: Confinement in Wendelstein 7-X Limiter Plasmas

Journal Article · · Nuclear Fusion
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  1. Max Planck Inst. for Plasma Physics, Greifswald (Germany)
  2. Research Centre for Energy, Environment and Technology (CIEMAT), Madrid (Spain)
  3. Inst. of Plasma Physics and Laser Microfusion (IPPLM), Warsaw (Poland)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Hungarian Academy of Sciences, Budapest (Hungary). Wigner Inst.
  6. Forschungszentrum Julich (Germany)
  7. Opole Univ. (Poland)
  8. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  9. Alternative Energies and Atomic Energy Commission (CEA), Cadarache (France)
  10. Univ. of Cagliari (Italy)
  11. Univ. of Wisconsin, Madison, WI (United States)
  12. National Inst. for Fusion Science (NIFS), Toki (Japan)
  13. Ecole Royale Militaire, Koninklijke Militaire School (ERM-KMS), Brussels (Belgium). Lab. for Plasma Physics
  14. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations

Observations on confinement in the first experimental campaign on the optimized Stellarator Wendelstein 7-X are summarized. In this phase W7-X was equipped with five inboard limiters only and thus the discharge length restricted to avoid local overheating. Stationary plasmas are limited to low densities <2–3 centerdot 1019 m-3. With the available 4.3 MW ECR Heating core Te ~ 8 keV, Ti ~ 1–2 keV are achieved routinely resulting in energy confinement time τE between 80 ms to 150 ms. For these conditions the plasmas show characteristics of core electron root confinement with peaked Te-profiles and positive Er up to about half of the minor radius. Lastly, profiles and plasma currents respond to on- and off-axis heating and co- and counter ECCD respectively.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE Office of Science (SC). Fusion Energy Sciences (FES) (SC-24); European Union (EU); USDOE
Contributing Organization:
EUROfusion Consortium; Wendelstein Team (W7-X); the W7-X Team
Grant/Contract Number:
AC52-06NA25396; 633053
OSTI ID:
1369186
Alternate ID(s):
OSTI ID: 1375764
Report Number(s):
LA-UR-16-27307
Journal Information:
Nuclear Fusion, Vol. 57, Issue 8; Conference: 26. IAEA Fusion Energy Conference , Kyoto (Japan), 17-22 Oct 2016; ISSN 0029-5515
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

References (16)

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Comparison between stellarator and tokamak divertor transport journal January 2011
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Variational bounds for transport coefficients in three‐dimensional toroidal plasmas journal March 1989
Setup and initial results from the magnetic flux surface diagnostics at Wendelstein 7-X journal May 2016
Limiter observations during W7-X first plasmas journal April 2017
Investigation of turbulence rotation in limiter plasmas at W7-X with newly installed poloidal correlation reflectometer journal April 2017
Core electron-root confinement (CERC) in helical plasmas journal August 2007
Performance and properties of the first plasmas of Wendelstein 7-X journal October 2016
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Physics optimization of stellarators journal March 1992
Three-dimensional free boundary calculations using a spectral Green's function method journal December 1986
High-density plasma with internal diffusion barrier in the Large Helical Device journal July 2009
Plans for the first plasma operation of Wendelstein 7-X journal November 2015

Cited By (7)

Global energy confinement in the initial limiter configuration of Wendelstein 7-X journal August 2018
Major results from the first plasma campaign of the Wendelstein 7-X stellarator journal July 2017
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies text January 2019
Radial energy flux during destabilized Alfvén eigenmodes journal October 2018
Magnetic configuration effects on the Wendelstein 7-X stellarator journal May 2018
Poloidal correlation reflectometry at W7-X: radial electric field and coherent fluctuations journal August 2017
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies journal November 2018

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Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Magnetic Fusion Energy
Wedelstein 7-X
stellarator
fusion
energy balance
particle confinement